Making a Square Grid

QuasarCreator · July 2012

Hello,

I am making a 20x20 square grid with squares that are 40x40 pixels.
Here is my code right now:

 
local a
local b = -1
local x
local y = -1
 
for h = 0, 20 do
	b = b + 1
	a = b * 40
 
	for i = 0, 20 do
		y = y + 1
		x = y * 40
		local square = Bitmap.new(Texture.new("images/square.png"))
		square:setPosition(x,a)
		self:addChild(square)
 
	end
end

However, I am only getting one row of squares. Here is my reasoning behind the code. The first loop let's call h and the second loop lets call i. So, I thought that once h has looped once i has looped 20 times, thus making 20 squares at the y coordinate of 0. Then when h loops again the y coordinate or a is added 40 pixels. Then i would loop another 20 times , thus making 20 squares at the y coordinate of 40. Then it keeps going until h has looped twenty times and i has looped 400 times. Since I am only getting one row of 20 squares, I don't get why it isn't looping more times and adding 40 to the y coordinate each time h loops.

So, please help me understand why my code isn't working the way I intended. Thank you very much!!

P.S. I didn't get any errors.

ar2rsawseen · July 2012

Well your problem is that, you need to reset x coordinate after each 20 loops, or else your squares are positioned like that:
0 0 0 0
_ _ _ _ 0 0 0 0
_ _ _ _ _ _ _ _ 0 0 0 0
etc.
They are probably getting outside the screen or something.

So I guess something like that:

local a
local b = -1
local x
local y = -1
 
for h = 0, 20 do
	b = b + 1
	a = b * 40
 
	for i = 0, 20 do
		y = y + 1
		x = y * 40
		local square = Bitmap.new(Texture.new("images/square.png"))
		square:setPosition(x,a)
		self:addChild(square)
 
	end
	y = -1
end

Should do the trick.
Funny that you mentioned it, while I was just working on one of components called GridView for new GameTemplate

QuasarCreator · July 2012

@ar2rsawseen Thank you so much it works perfectly! I never thought that my squares were outside my screen since.

I also wanted to say that your GameTemplate has helped me so much and probably every other beginner out there, so thanks.

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